<template>
    <div>
        <div class="search">
            <input v-model="keyword" class="search-input" type="text" placeholder="输入城市名或拼音" />
        </div>
        <!-- 有输入关键词的时候显示search-content -->
        <div class="search-content" ref="search" v-show="keyword">
            <ul>
                <li class="search-item border-bottom" v-for="item in list" :key="item.id" @click="handleCityClick(item.name)">{{ item.name }}</li>
                <!-- list长度为0显示以下内容 -->
                <!-- <li class="search-item border-bottom" v-show="!list.length">没有找到匹配数据</li> -->
                <li class="search-item border-bottom" v-show="hasNoDate">没有找到匹配数据</li>
            </ul>
        </div>
    </div>
    
</template>

<script>
import BScroll from 'better-scroll'
import { mapMutations } from 'vuex'
export default {
    name:'CitySearch',
    // props:{
    //     cities:Object
    // },
    props:['cities'],
    data() {
        return {
            keyword: '', //输入的关键词
            list:[], //存放搜索到的城市
            timer:null
        }
    },
    mounted() {
        this.scroll = new BScroll(this.$refs.search) 
    },
    methods: {
        handleCityClick(city) {
            // alert(city);
            this.changeCity(city);
            this.$router.push('/'); //通过路由跳转到首页
        },
        ...mapMutations(['changeCity']) //有个mutations叫changeCity，把mutations映射到这个组件名字叫changeCity的方法里
    },
    computed: {
        hasNoDate() {
            return !this.list.length;
        }
    },
    watch: {
        keyword() {
            if(this.timer){
                clearTimeout(this.timer);
            }
            if(!this.keyword){
                this.list = [];
                return
            }
            this.timer = setTimeout( ()=>{
                const result = [];
                for(let i in this.cities){
                    this.cities[i].forEach( (value)=>{
                        if(value.spell.indexOf(this.keyword)>-1 || value.name.indexOf(this.keyword)>-1){
                            result.push(value);
                        }
                    })
                }
                this.list = result;
            },100)
        }
    }
}
</script>

<style lang="stylus" scoped>
    @import '~styles/varibles.styl'
    .search
        height: .72rem
        padding: 0 .1rem
        background-color: $bgColor
        .search-input
            box-sizing: border-box
            width: 100%
            height: .62rem
            line-height: .62rem
            text-align: center
            border-radius: .06rem
            color: #666
            padding: 0 .1rem
    .search-content
        z-index: 1
        overflow: hidden
        position: absolute
        top: 1.58rem
        left: 0
        right: 0
        bottom: 0
        background: #eee
        .search-item
            line-height:.62rem
            padding-left: .2rem
            background: #fff
            color: #666
</style>